21830453 has 2 divisors, whose sum is σ = 21830454. Its totient is φ = 21830452.

The previous prime is 21830387. The next prime is 21830507. The reversal of 21830453 is 35403812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19864849 + 1965604 = 4457^2 + 1402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21830453 - 2¹⁴ = 21814069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21830353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915226 + 10915227.

It is an arithmetic number, because the mean of its divisors is an integer number (10915227).

Almost surely, 2^21830453 is an apocalyptic number.

It is an amenable number.

21830453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830453 is an equidigital number, since it uses as much as digits as its factorization.

21830453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21830453 is about 4672.3070318634. The cubic root of 21830453 is about 279.4822617959.

The spelling of 21830453 in words is "twenty-one million, eight hundred thirty thousand, four hundred fifty-three".